U0304
Software Incompatibility With Gear Shift Control Module A
U0304 is an OBD-II diagnostic trouble code meaning: Software Incompatibility With Gear Shift Control Module A. Common causes: incompatible software versions in the ecu and gearshift module, software update error. Estimated repair cost: ~$167.
Symptoms
- Incorrect gear shifting
- Check Engine Light Illuminates
- Loss of engine power
- Switching to emergency mode
- Problems starting the engine
Causes
- Incompatible software versions in the ECU and gearshift module
- Software update error
- Damage to module software
- Shift module malfunction
- Problems with communication between modules
How to Fix
- Check software versions in both modules
- Update or reinstall the software in the problematic module
- Check the integrity of the wiring harness between the modules
- Test the gear shift module
- If necessary, replace the gear shift module
Related codes
Error U0304 by Vehicle Brand
FAQ
What does the U0304 code mean?
U0304 is an OBD-II diagnostic trouble code that indicates: Software Incompatibility With Gear Shift Control Module A
What causes a U0304 error code?
The most common causes of U0304 include: Incompatible software versions in the ECU and gearshift module; Software update error; Damage to module software; Shift module malfunction.
How do I fix a U0304 diagnostic trouble code?
To fix U0304: Check software versions in both modules. Update or reinstall the software in the problematic module. Check the integrity of the wiring harness between the modules. For a complete diagnosis, use an OBD-II scanner.
Is it safe to drive with U0304?
Limited driving only, diagnose soon
How much does it cost to fix U0304?
The estimated repair cost for U0304 is ~$167. Actual cost depends on your vehicle, location, and labor rates.
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